K-mouflage at high $k$: extending the reach of $\text{Hi-COLA}$

Abstract

The $\text{Hi-COLA}$ code is an efficient dark matter simulation suite that flexibly handles the Horndeski family of modified gravity models. In this work we extend the scope of $\text{Hi-COLA}$ to accommodate Horndeski theories with K-mouflage screening, allowing for the computation of matter power spectra in the non-linear regime in these models. We explore the boost of the dark matter power spectrum relative to GR-$\Lambda$CDM in K-mouflage gravity, and also discuss how large-scale structure computations change between the Einstein and Jordan frames. A dissection of the relative contributions of the modified background, linear growth, fifth force, and the conformal factor (a new inclusion to $\text{Hi-COLA}$) to the boost factor is presented. The ability of $\text{Hi-COLA}$ to run with general Horndeski models and multiple screening mechanisms makes it an ideal tool for testing gravity with upcoming galaxy survey data.

arXiv comment32 pages, 10 figures, 1 table. Comments welcome. Updated to include additions in the version published in JCAP. The Hi-COLA code can be found at https://github.com/Hi-COLACode/Hi-COLA

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